Carl Seibert Posted March 4 Author Share #21 Posted March 4 Advertisement (gone after registration) OK. So here's what I did. Lacking any actionable data from the companies, I devised an experiment using ImageMagick's "Compare" function. I made a PSD of an image (I tried to use a TIFF, but ImageMagick barfed on that.) I then used ImageMagick to compare exported JPEGs from ON1 at 100% quality and Capture One at 100%, 99%, 97%, 95%, and 90%. I used ImageMagick's Mean Absolute Error metric and the result was two numbers for each comparison. According to ImageMagick, the numbers show how similar the two images are. Smaller numebrs are more similar. Damned if I know what the units for these numbers are or whether they scale linearly or logarithmically, or whatever. If anybody knows where to look in IM's documentation, please let us know. What I got was: PSD vs C1 100% 177.246 (0.0027046) PSD vs C1 99% 239.145 (0.00364912) PSD vs C1 98% 288.223 (0.004398) PSD vs On1 100% 302.002 (0.00460825) PSD vs C1 97% 327.593 (0.00499875) PSD vs C1 95% 398.28 (0.00607737) PSD vs C1 90% 531.061 (0.00810347) Which makes it look like I can safely use the 98% setting in Capture One and have reasonable equivalent results, compared to the ON1 settings I have been using for years. Mind you, I have not a clue how these numbers equate to real-world quality. I can say that these results seem to track with what I saw in the images, which was basically from the C1 98% level and up and the ON1 100% level, I couldn't really see any difference to the standard. File sizes tracked about the same way. The ON1 field was 34MB. The C1 98% was 35MB. The C1 97% was 32MB, and the C1 100% was 47MB. So there. (Until or unless somebody points out that my methodology was screwed up.) Link to post Share on other sites More sharing options...
Advertisement Posted March 4 Posted March 4 Hi Carl Seibert, Take a look here Giant JPEGs from Capture One?. I'm sure you'll find what you were looking for!
Chris W Posted March 4 Share #22 Posted March 4 12 hours ago, Carl Seibert said: According to Capture One, all of their forums are no more. Oh, I was only on there a few weeks ago. I see it stopped operating on Feb 14th. Link to post Share on other sites More sharing options...
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